Ios (Greek: Ίος, locally Νιός - Nios) is a Greek island in the Cyclades group in the Aegean Sea. Ios is a hilly island with cliffs down to the sea on most sides, situated halfway between Naxos and Santorini. It is about 18 kilometres (11 miles) long and 10 kilometres (6 miles) wide, with an area of about 109 square kilometres (42 sq mi). Ios is part of the Thira regional unit.
The Port of Ios is at the head of the Ormos harbor in the northwest. From there the bus or a 15-minute walk up the steep donkey path takes you to the village, known as Chora. Chora is a white and very picturesque cycladic village, full of stairs and narrow paths that make it inaccessible for cars of any kind. Today, the main path through this village is completely taken over by tourism in terms of restaurants, boutiques, bars and discothèques. Apart from the port and the village of Chora, Ios has only a few small settlements, just a group of spread out houses in the background of major beaches (Theodoti, Kalamos, Maganari).